Four things must all be true before a C-more Micro panel and a DL06 PLC will talk on RS-422: the converter must match the panel model, the mode switch must be in TERM, DEV1 must copy Port 2's exact serial values, and termination must sit at both ends of the run. Check them in that order.
A C-more Micro panel that stays silent on a DL06 Port 2 RS-422 link usually fails on one of four things, and the wiring is the last of them. Check in this order: the converter must belong to the panel model you actually have, the DL06 mode switch must be in TERM, the DEV1 settings must copy Port 2 exactly, and termination must sit at both ends of the run. The EA-COMCON-3 is the first suspect, because it is documented for the C-more Display panel and not for the Micro. These are the same checks we walk through for any shop-floor screen link.
Why does the wiring look right when the link is dead?
Because on this link the wiring is one gate out of four, and a cable can be landed perfectly and still carry nothing: the converter must match the panel model, the mode switch must read TERM, the serial values must match, and both ends need termination. The panel is the master on this link: it asks, the PLC answers, so a break anywhere in that chain shows up on the panel as the same silence. Work the gates from the cheapest to the most disruptive. Reading a label and a switch costs nothing. Settings cost a project download. Wiring costs a power-down and a retermination. The checks below run in that order.
What does your failure look like?
Total silence from power-up points at the interface, the mode switch or the settings; a link that comes and goes points at the physical layer; reads that work while writes do nothing point back at the switch. Sort your symptom first, because it cuts the checklist roughly in half.
- Silence from the first poll, a communication fault on the panel, no value ever displayed. The four checks below separate this: converter identity, mode switch, DEV1 values, termination. A run terminated at one end only behaves exactly like this, completely dead.
- The panel reads values but a write from the panel does nothing. The switch position is the next read, even when it already looks right.
- Values appear, then stick, or faults arrive and leave with machine activity. Reseat the conductors in the Port 2 4-pin terminal and confirm the terminations at each end of the run.
Which converter belongs on the panel you have?
Read the full model number off the panel label first: the EA-COMCON-3 is documented for the C-more Display panel, so on a C-more Micro it is the wrong interface and no wiring fixes that. Everything downstream depends on this one label.
If the label says C-more Display, keep the EA-COMCON-3. Chapter 6 of the C-more Display hardware manual's PLC communications chapter prints the wiring for each panel-to-PLC combination, the DL06 included, along with the ZIPLink terminal wiring that simplifies RS-422 and RS-485 hookups.
If the label says C-more Micro, set the EA-COMCON-3 aside and use the C-more Micro hardware manual's DL06 Port 2 diagram. The recommended cable runs from the DL06 Port 2 4-pin terminal to the Micro's COM1, a DB9 male connector. The ZL-CMA15L on the PLC end lands where that diagram says it lands; the diagram for the panel you own decides the landing, never the shape of the connector. For isolated RS-422 and RS-485 lines generally, the FA-ISOCON universal isolated network adapter is the field alternative. The DL06's Port 2 is a multifunction port settable as RS-232, RS-422 or RS-485, and the DL05 and DL06 specification sheet documents the port options for each model.
Where does the DL06 mode switch have to be?
In TERM: that position keeps the serial exchange available while the processor runs, and a switch left in another position stops the exchange with the cable and the settings untouched. This is the cheapest check on the whole job, so do it before anything else. What the TERM position permits for panel communications, and what happens to the run when you change it, is worth one read before you move the switch. If the switch already reads TERM and the panel still will not write, cycle the mode switch once and test again.
How do you set DEV1 to match Port 2?
Open Setup > Panel Manager > DEV1 in the panel project and PLC > Setup > Setup Sec. Comm Port in the PLC software, then copy Port 2's values into DEV1 one for one: baud rate, data bits, parity, stop bits. Set Port 2 to RS-422 before you compare anything, and write down what the screen shows so the comparison is against a number you read today.
The device behind DEV1 must be the DL06. A project carried over from a CLICK keeps its old device entry, and a correctly wired cable cannot carry a protocol the far end does not speak, so check the protocol before reusing a panel on a different PLC. The Panel Manager click path is the same one used for setting the PLC type in Panel Manager.
How do you land the pairs and the termination?
Two twisted pairs plus shield, transmitter to receiver at each end, then a termination resistor at the panel end and another at the PLC end: one end only leaves this link completely dead. Power down the panel and the PLC before you touch the Port 2 terminal or the COM1 connector; that is the one safety stop on this job.
RS-422 is the TIA/EIA-422 electrical standard: balanced differential signaling on twisted pairs, with a driver that must swing at least 2 V differential into a 100 Ω load and receivers that resolve 200 mV. Its classic planning figure is about 4000 ft of cable at low data rates, so a panel across the room is nowhere near the distance limit, and termination still decides whether the line works at all.
Follow the Micro manual's DL06 diagram for which conductor lands on which terminal, keep each pair twisted all the way to its termination, and land the shield where that diagram shows. Match the resistor to your cable's characteristic impedance, which the cable's data sheet states. The Micro manual's RS-422 and RS-485 diagrams cover one panel to one PLC; hanging several PLCs off one panel is a multidrop, a different layout with different termination placement, so wire it from a diagram drawn for that topology.
What does a complete example look like?
A 6-inch C-more Micro, 120 ft of shielded twisted pair to a DL06, and a panel that never displays a value: here is the whole fix with the numbers carried through. Treat the serial values below as example inputs; yours are whatever your Port 2 screen shows, and DEV1 copies them.
The label on the back of the panel reads C-more Micro. The EA-COMCON-3 comes out of the circuit, and the cable goes in per the Micro manual: DL06 Port 2 4-pin terminal on one end, COM1 DB9 male on the other. The mode switch goes to TERM. On the PLC side, PLC > Setup > Setup Sec. Comm Port shows Port 2 set to RS-422 at 19200 bps, 8 data bits, even parity, 1 stop bit. Setup > Panel Manager > DEV1 gets the DL06 device at the same 19200 bps, 8 data bits, even parity, 1 stop bit. A resistor goes on at the panel end and another at the PLC end.
The arithmetic shows why a half-matched link is a silent one. One character frame is 1 start + 8 data + 1 parity + 1 stop = 11 bits. At 19200 bps a frame lasts 11 / 19200 s = 0.00057 s, about 0.57 ms, and the line moves 19200 / 11 = 1745 frames a second. If DEV1 was still at 9600 bps from the CLICK project, the panel puts each frame out in 0.57 ms while the PLC listens for 11 / 9600 s = 1.15 ms, exactly twice as long, so no character is ever decoded and the panel reports silence, not errors. Fix that one field, download the project, and the first poll succeeds.
How do you confirm the link and close it out?
Watch a live value on the panel follow a forced input in the PLC, then write one register from the panel and read it back in the PLC software: both directions confirmed, the link is closed out. Save the panel project, and record the Port 2 values, the DEV1 values and the manual diagram you wired from, because the next person gets the same silence if any one of those changes. If all four checks pass and the line is still dead, stop swapping wires. Collect the panel model number, the PLC model, the converter and cable part numbers, both settings screens and the diagram page, and take that list to the manufacturer's product support.
Recommendation: if the label says C-more Micro, set the EA-COMCON-3 aside, wire COM1 to DL06 Port 2 from the Micro manual's diagram, put the switch in TERM, copy Port 2's values into DEV1, and terminate both ends; if the label says C-more Display, keep the EA-COMCON-3 and wire from chapter 6 of the Display manual for the DL06.
Questions
Can the EA-COMCON-3 be used with a C-more Micro panel?
No. That converter is documented for the C-more Display panel. On a Micro, wire the DL06 Port 2 4-pin terminal to the COM1 DB9 male connector with the cable the Micro hardware manual recommends, or use the FA-ISOCON isolated network adapter where you want galvanic isolation on the line.
Why does the DL06 have to be in TERM for the panel link?
TERM is the switch position that keeps the serial exchange available while the logic runs, which is what a panel needs. With the switch elsewhere the exchange stops even though the cable and the settings are correct. If the panel reads values but will not write after you set TERM, cycle the switch once and test again.
Do both ends really need termination on a short run?
Yes, on this pairing. The requirement for the C-more to DL06 RS-422 link is a resistor at the panel end and another at the PLC end; missing it at either end leaves the line completely dead. The value follows the cable's characteristic impedance, so pick it from the cable's data sheet.
What should you have ready before calling support about a dead link?
Six items: the full model number from the panel label, the DL06 model, the part numbers of the converter and cable, the Port 2 settings from PLC > Setup > Setup Sec. Comm Port, the DEV1 settings, and the manual diagram page you wired from. With those, support can rule out the whole checklist in one call.
Planning information, not legal or engineering advice. Rules differ by place: check codes and permits with your local authority and your licensed trades.